private void giris_yap(object sender, RoutedEventArgs e) { var mydetails = restAPI.GetSignup(); foreach (var item in mydetails) { if ((Email.Text == item.Email) & (Parola.Password == item.Parola)) { //MessageBox.Show("Hoşgeldiniz",item.Name+item.Surname); MainWindow main = new MainWindow(); main.Show(); } //else //{ // MessageBox.Show("Basarısız"); //} } }